From: Maxime Ripard <maxime.ripard@free-electrons.com>
To: Icenowy Zheng <icenowy@aosc.io>
Cc: Chen-Yu Tsai <wens@csie.org>,
devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org, linux-sunxi@googlegroups.com
Subject: Re: [linux-sunxi] Re: [PATCH] ARM: sun8i: h2+: add support for Banana Pi M2 Zero board
Date: Thu, 2 Nov 2017 16:50:03 +0100 [thread overview]
Message-ID: <20171102155003.vp7uve4ypyn4sb6j@flea> (raw)
In-Reply-To: <8327eaeaa12b99f9962a53c9f02ddd6d@aosc.io>
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On Thu, Nov 02, 2017 at 05:07:30PM +0800, Icenowy Zheng wrote:
> > > +&mmc0 {
> > > + pinctrl-names = "default";
> > > + pinctrl-0 = <&mmc0_pins_a>;
> > > + vmmc-supply = <®_vcc3v3>;
> > > + bus-width = <4>;
> > > + /*
> > > + * In different revisions the board have different card detect
> > > + * configuration.
> > > + */
> >
> > Which ones?
>
> In the sample batch (1.2V fixed voltage) the card detect is normal
> (PF6 low as inserted), however in the final batch (1.1V/1.3V
> switchable) it's inverted at PF6 (high as inserted).
Then just use the final version's.
> > > +&usbphy {
> > > + usb0_id_det-gpios = <&r_pio 0 6 GPIO_ACTIVE_HIGH>; /* PL6 */
> > > + /* USB OTG VBUS is directly connected to 5V without any regulators
> > > */
> >
> > So it cannot operate in OTG, but it's host only?
>
> It can operate in OTG -- you can power the board via the OTG port,
> as the VBUS is not gated from 5V at all, so 5V power at VBUS will
> power up the board. Yes, it's a bit unsafe, but the board designer
> did it.
What will provide the 5v in the first place then if a USB device is
connected to the micro-USB connector?
Maxime
--
Maxime Ripard, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com
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next prev parent reply other threads:[~2017-11-02 15:50 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-11-01 9:38 [PATCH] ARM: sun8i: h2+: add support for Banana Pi M2 Zero board Icenowy Zheng
[not found] ` <20171101093814.19177-1-icenowy-h8G6r0blFSE@public.gmane.org>
2017-11-02 9:02 ` Maxime Ripard
2017-11-02 9:07 ` [linux-sunxi] " Icenowy Zheng
2017-11-02 15:50 ` Maxime Ripard [this message]
2017-11-02 23:53 ` Icenowy Zheng
[not found] ` <b548b74e04b29ec8c3cddb7cc42f2b4e-h8G6r0blFSE@public.gmane.org>
2017-11-13 8:20 ` Maxime Ripard
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